Deep hands-on AWS architecture experience across core services, including VPC, IAM, EC2, ECS/EKS, Lambda, S3, RDS, Route 53, CloudFront, CloudWatch, KMS, and related networking and security controls. Define and maintain reusable cloud reference architectures and patterns for areas such as multi-account design, networking, identity and access, compute, containers, data, integration, observability, and disaster recovery.